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EP 4 127 782 A1

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(43) Date of publication: 08.02.2023 Bulletin 2023/06 (21) Application number: 21780302.2 (22) Date of filing: 30.03.2021

(51) International Patent Classification (IPC):  G01V 1/50(1995.01) G01V 1/52(1995.01) G01V 99/00(2009.01) G01V 1/46(1995.01) G01V 1/30(1968.09) E21B 47/14(1995.01) (52) Cooperative Patent Classification (CPC): G01V 1/50; G01V 2210/1299; G01V 1/366; G01V 1/44; G01V 2210/21; G01V 2210/51; G01V 1/362; G01V 2210/57 (86) International application number: PCT/US2021/024959 (87) International publication number: WO 2021/202582 (07.10.2021 Gazette 2021/40)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 31.03.2020 US 202063002976 P (71) Applicants: Services Pétroliers Schlumberger 75007 Paris (FR) FR  Schlumberger Technology B.V. 2514 JG The Hague (NL) AL AT BE BG CH CY CZ DE DK EE ES FI GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(72) Inventors: HIRABAYASHI, Nobuyasu Sugar Land, Texas 77478 (US) KARPEKIN, Yevgeniy Moscow, 125171 (RU) BENNETT, Nicholas Norman Cambridge, Massachusetts 02139 (US) DONALD, John Adam 011141 Bucharest (RO) JOHANSEN, Asbjoern Lund Houston, Texas 77056 (US) ENDO, Takeshi Sugar Land, Texas 77478 (US) (74) Representative: Schlumberger Intellectual Property Department  Parkstraat 83 2514 JG Den Haag 2514 JG Den Haag (NL)